Network Positioning; Compass - Nokia N97 User Manual

accuracy of location data can be affected by
adjustments to GPS satellites made by the United
States government and is subject to change with
the United States Department of Defense civil GPS
policy and the Federal Radionavigation Plan.
Accuracy can also be affected by poor satellite
geometry. Availability and quality of GPS signals
may be affected by your location, buildings, natural
obstacles, and weather conditions. The GPS signals
may not be available inside buildings or
underground and may be impaired by materials
such as concrete and metal.
GPS should not be used for precise location
measurement, and you should never rely solely on
location data from the GPS receiver and cellular
radio networks for positioning or navigation.
The trip meter has limited accuracy, and rounding
errors may occur. Accuracy can also be affected by
availability and quality of GPS signals.
Assisted GPS (A-GPS) is used to retrieve assistance
data over a packet data connection, which assists in
calculating the coordinates of your current location
when your device is receiving signals from
satellites.
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Network positioning

Select Menu > Maps.
You can use the mobile network to find your current
location, even indoors. This is faster but less
accurate than with GPS, and you cannot use the
location as a starting point for navigation.
To use the mobile network for positioning, select
the network-based positioning method from the
device settings. When you start the Maps
application and your GPS connection is ready, GPS
replaces mobile network as the positioning
method.

Compass

Your device has an internal compass. When the
compass is enabled, the circle around the compass
is green, and the map view rotates automatically
according to the direction to which the top of the
device is pointing.
The compass should always be properly calibrated.
Electromagnetic fields, large metal objects, and
other external circumstances may reduce the
accuracy of the compass. Never rely solely on the
device compass.
To calibrate the compass:
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